From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 108741339A4 for ; Fri, 6 Jun 2025 14:28:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749220114; cv=none; b=ZAyZpWTBGxwtl9tpDzc8qoo0aob/LzFR97sgHUwWozV6LCGPf15lDA5Dg5q8OiHHTj3vwn/yEU2+03xIg0rrI1TzXSiwR9j4Cyuxpb4JRYTj4xOXf+ZhUUe0i+ScFXSDMVKT9kfsFn8qJh2FrxglttXDDDGWlCg/IqqOqxEXLTk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749220114; c=relaxed/simple; bh=biYcYaU5eBW9WP/dymTI+cSw8ql6koScbNr6aIjyULM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=qKah19d2n/8kmD/LdOx7E1R5zsmhnQOUxVhQXN+0B+S3A6++XeMlr9NowEVm3n+X0fUvA5llqC84V4HZJ/SL4HCJIBuqaB9fVqI4Un2nWR6RXUhwYxpr2jHdCbbXM6xuH/Aftrc0iIDyPbzZavl+VUniJpgdnLj9wM1bboswS+I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-3ddc3f14171so29037295ab.0 for ; Fri, 06 Jun 2025 07:28:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749220111; x=1749824911; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=p9O7Vw9hq24JSKUy5LWCCSKNu/YQohpnts9uAfWp4Yk=; b=ETCjuqA0B1P/IvdDLv0RoNvkGeDucw6EIs0NAyH+YAuky/kNI23B6PV42z+sjbAl+a 8FnPurdVqywz5UM4nClIX3HrMRaPqfX2ACENNVVcKW30PplMFII9sHn8K10W0Dy2lVZ5 G+DTGuZL8LU+sfB1HXvwuEgPWSLQoxVoOiHLG5rRFmBlS/RHGmAb9KL47UG9w6nAm3mK 3krJa7kay/Ozy2WO+KnAys/scupr9VpUIeKsA0QK/crUe1Nrno05XR7fFw+DQfLFYYwk QHnGSe2cEqciWxBE1hk4PCPjlxs7zSAaDRGfuzgOzHKWXZo7cOC7+XZWwonX8PzVoMuC 2RqQ== X-Forwarded-Encrypted: i=1; AJvYcCWQvZOC0bh0UjRF7ir3oUf5ZFx+oIgtgxOpv4nKSjltFgU41pvDQEN2SSlkiu/WdTi0aqc77AS5R1tisv0=@vger.kernel.org X-Gm-Message-State: AOJu0Yzva1ComGtnYyHKv2O5a53WRTpCl7ncIDJ+zGSxWC59mc+wSUbn mmB4BAViuGx1RyfXB9nDs/1hQZo3g5DrxR8cQmPU82o7U0rj1acqDx3mui41zr+7xh5C55Z+bBv Iw6xIr6K/IqA0TXLbzuAtiPgRZ+pvdIc/yDBUONwwtG+6ea5Wev/S2bbW1M4= X-Google-Smtp-Source: AGHT+IGl3VUXOeQZGwKedAVyHMmazJe0L0rP4hWudnpGDWFuFI6Fr2VW+cKwX5SSjX8EKM/SVw6ysE7DqQ76EX7zBnKXNp3k6WO9 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:380d:b0:3dc:868e:dae7 with SMTP id e9e14a558f8ab-3ddce441589mr42066485ab.15.1749220111133; Fri, 06 Jun 2025 07:28:31 -0700 (PDT) Date: Fri, 06 Jun 2025 07:28:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6842fb0f.a00a0220.29ac89.0042.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in sys_unlinkat (3) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 92a09c47464d Linux 6.15-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=143530f4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=91c351a0f6229e67 dashboard link: https://syzkaller.appspot.com/bug?extid=61ec37db8c428baeb677 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1891731f8dec/disk-92a09c47.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d0de4fa2c8c2/vmlinux-92a09c47.xz kernel image: https://storage.googleapis.com/syzbot-assets/53a4edfaecf1/bzImage-92a09c47.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61ec37db8c428baeb677@syzkaller.appspotmail.com sched: DL replenish lagged too much rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6265/1:b..l rcu: (detected by 0, t=10503 jiffies, g=19425, q=859 ncpus=2) task:syz-executor state:R running task stack:22008 pid:6265 tgid:6265 ppid:6251 task_flags:0x400140 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] RIP: 0010:__page_table_check_zero+0x1f9/0x510 mm/page_table_check.c:142 Code: 89 ee e8 fa 26 93 ff 4c 39 ed 0f 84 6c 01 00 00 4c 8b 3d 5a 2c db 0b 4d 01 e7 4c 89 ff be 04 00 00 00 e8 7a 1b f5 ff 4c 89 f8 <48> c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 RSP: 0018:ffffc9000b5ef790 EFLAGS: 00000256 RAX: ffff88801d1b29b8 RBX: 0000000000000000 RCX: ffffffff822cabd6 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801d1b29b8 RBP: 0000000000000008 R08: ffff88801d1b29bb R09: 1ffff11003a36537 R10: dffffc0000000000 R11: ffffed1003a36538 R12: ffff88801d1b2970 R13: 0000000000000003 R14: 000000000005d6e9 R15: ffff88801d1b29b8 page_table_check_free include/linux/page_table_check.h:41 [inline] free_pages_prepare mm/page_alloc.c:1263 [inline] __free_frozen_pages+0xb22/0xcd0 mm/page_alloc.c:2725 __slab_free+0x326/0x400 mm/slub.c:4553 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4339 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x28b/0x550 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x58d/0x5d0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822 tomoyo_path_rmdir+0xa2/0xe0 security/tomoyo/tomoyo.c:195 security_path_rmdir+0x167/0x360 security/security.c:1949 do_rmdir+0x219/0x630 fs/namei.c:4506 __do_sys_unlinkat fs/namei.c:4683 [inline] __se_sys_unlinkat fs/namei.c:4677 [inline] __x64_sys_unlinkat+0xc2/0xf0 fs/namei.c:4677 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f36e318df47 RSP: 002b:00007ffdf6aecb78 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f36e318df47 RDX: 0000000000000200 RSI: 00007ffdf6aedd20 RDI: 00000000ffffff9c RBP: 00007f36e321089d R08: 000055555c96962b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffdf6aedd20 R13: 00007f36e321089d R14: 0000000000033668 R15: 00007ffdf6aeedf0 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup